/**
 * Copyright (c) 2018 人人开源 All rights reserved.
 * <p>
 * https://www.renren.io
 * <p>
 * 版权所有，侵权必究！
 */

package com.tecklab.demo.utils;

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;

/**
 * 获取IP地址工具类
 * @author sunking
 * @date  2025/9/25 19:29
 */
public class IpUtils {
    private static Logger logger = LoggerFactory.getLogger(IpUtils.class);

    /**
     * 获取IP地址
     *
     * 使用Nginx等反向代理软件， 则不能通过request.getRemoteAddr()获取IP地址
     * 如果使用了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP地址，X-Forwarded-For中第一个非unknown的有效IP字符串，则为真实IP地址
     */
    public static String getIpAddr(HttpServletRequest request) {
        String unknown = "unknown";
        String ip = null;
        try {
            ip = request.getHeader("x-forwarded-for");
            if (StringUtils.isBlank(ip) || unknown.equalsIgnoreCase(ip)) {
                ip = request.getHeader("Proxy-Client-IP");
            }
            if (StringUtils.isBlank(ip) || ip.length() == 0 || unknown.equalsIgnoreCase(ip)) {
                ip = request.getHeader("WL-Proxy-Client-IP");
            }
            if (StringUtils.isBlank(ip) || unknown.equalsIgnoreCase(ip)) {
                ip = request.getHeader("HTTP_CLIENT_IP");
            }
            if (StringUtils.isBlank(ip) || unknown.equalsIgnoreCase(ip)) {
                ip = request.getHeader("HTTP_X_FORWARDED_FOR");
            }
            if (StringUtils.isBlank(ip) || unknown.equalsIgnoreCase(ip)) {
                ip = request.getRemoteAddr();
            }
        } catch (Exception e) {
            logger.error("IPUtils ERROR ", e);
        }

        return ip;
    }

    /**
     * 获取IP地址（确保在Web请求线程中调用！！！）
     * @return
     */
    public static String getIpByRequest() {
        String unknown = "unknown";
        String ip = null;
        ServletRequestAttributes requestAttributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        if (requestAttributes != null) {
            HttpServletRequest request = requestAttributes.getRequest();
            try {
                ip = request.getHeader("x-forwarded-for");
                if (StringUtils.isBlank(ip) || unknown.equalsIgnoreCase(ip)) {
                    ip = request.getHeader("Proxy-Client-IP");
                }
                if (StringUtils.isBlank(ip) || ip.length() == 0 || unknown.equalsIgnoreCase(ip)) {
                    ip = request.getHeader("WL-Proxy-Client-IP");
                }
                if (StringUtils.isBlank(ip) || unknown.equalsIgnoreCase(ip)) {
                    ip = request.getHeader("HTTP_CLIENT_IP");
                }
                if (StringUtils.isBlank(ip) || unknown.equalsIgnoreCase(ip)) {
                    ip = request.getHeader("HTTP_X_FORWARDED_FOR");
                }
                if (StringUtils.isBlank(ip) || unknown.equalsIgnoreCase(ip)) {
                    ip = request.getRemoteAddr();
                }
            } catch (Exception e) {
                logger.error("IPUtils ERROR ", e);
            }
        }

        return ip;
    }

}
